Rotary pump



J. 5. AMES ROTARY PUMP Sept. 1,' 1942.

Filed June 18, 1940 2 Sheets-Sheet 1 s e m A S J 'INVENTOR ATTORNEYS J WM J. 8. AMES ROTARY PUMP Sept. 1, 1942.

Filed June 18, 1940 2 Sheets-Sheet 2 INVENTOR J. $.Ames

m2: r-fl/MJJ ATTORNEYS Patented Sept. 1, 1942 UNITED STATES PATENT OFFICE ROTARY PUMP John S. Ames, Oakdale, Calif., assignor of onehalf to Lester H. Brown, Salida, Calif.

Application June 18, 1940, Serial No. 341,143

2 Claims. (Cl. 103-136) This invention relates to rotary pumps, and particularly to a water pump of this character, though its utility is not limited to this field.

The pump is of that type which includes 'a rotor, a casing forming a chamber in which the rotor is turnable and having an odd-shaped internal periphery relative to the rotor and con tacting the same at certain points, and radial vanes slidable in the rotor to constantly engage the periphery of the chamber.

Such an arrangement necessitates alternating radial in and out movements of the vanes with the rotation of the rotor, and such movements must take place without lag if pumping mciency is to be had.

It is therefore the principal object of my invention to provide a means for obtaining or expediting such movement of the vanes without relying on the use of such means as heavy springs to obtain the outward radial movement, or upon the pressure of the chamber wall against the vanes to obtain the radial inward movement. By my improved arrangement as hereafter described, the severe friction and wear incident to the above mentioned expedients are overcome,

and the pump runs freer and more smoothly.

Asa result of my improved features, I have provided a pump having few moving parts, wear thereon is very light, and much greater emciency is obtained than with an ordinary centrifugal or similar type pump.

A. further object of the invention is to produce a simple and inexpensive device and yet one which will be exceedingly effective for the purpose for which it is designed.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views:

Figure 1 is a front view of-the improved pump, with the front end plate removed and the easing partly in section.

Figure 2 is a similar view of the casing with the rotor removed.

Figure 3 is a transverse section substantially on line 3--3 of Fig. 1.

Figure 4 is a back view of the rotor detached.

Referring now more particularly to the char-. acters of reference on the drawings, the pump radially cut from end to end at circumferentially spaced points to form slots 4, closed by the end plates, in which the vanes 5 are slidable. The back plate'has ports 4a therethrough and leading to the slots adjacent their inner end. One or more light springs 6 under the vanes urge the same radially out without any great degree of pressure.

The rotor is concentrically mounted in the chamber I of a; casing 8 in spaced relation to the circumferential wall thereof. The casing is closed at its ends by front and back plates 9 and H) shapedon their inner face to engage the rotor end plates 2 and the side edges of the vanes outwardly of plates 2 as well. The shaft 3 projects through a packing gland H in plate 9 and is socketed in plate ill.

The casing is formed on the inside of the chamber 1 and for the full width between plates 9 and Ill, with abutments l2, each of which extends in opposite directions from a point of running contact P with the rotor to the periphery of the chamber with a gradual curvature, the curved faces of the abutments formin part of the internal or peripheral wall of the chamber. The number of abutments depends on the size of the pump, but two, diametrally opposed,

are preferably used in any event.

The abutments are provided with intake ports l3 beyond point P .relative to the direction of rotation of the rotor, and with outlet ports I ahead of point P. The two intake ports of course communicate with chamber I, and are connected to a single supply pipe by suitable conduit or passage means l5, here shown as being formed in the casing. Similarly, the outlet ports it are connected by a passage 16 formed in the casing. Since the adjacent ends of the passages must overlap each other, the ports l3 and H are laterally offset as plainly shown in Fig. 3.

With the above arrangement of parts, it will be seen that as the rotor turns, water will be alternately drawn into the chamber 1 from ports I3, and forced out through ports H, the vanes alternately moving in and out as they pass the abutments.

In order to expedite or aid the radial movement of each vane, as it passes along the intake portion of an abutment, a by-pass passage I1 is provided, this passage being here shown as being formed in the back plate Ill. The outer end of l and end plates 2 secured thereon, the rotor being fixed on a drive shaft 3. The

the passage l1 taps the adjacent'outlet port H, while the other and radially inner end terminates at the rotor engaging face of plate Ill in body l is position and of an extent to register with rotor ports in during the arcuate movement of the vanes along the'intake side of the abutment.

Similarly, another bypass passage I. in the plate l leads from outlet port It to an inner ter- I mination in position to register with rotor ports in during the arcuate movement of the vanes along the outlet side oi the abutment. The passages and II thus cross each other, their inner ends being thus in opposed relation to their outer ends, relative to a radial line drawn from the axis 01' the rotor through the abutment contact point P.

As a result of the passages l7 and I8 arranged as defined, the vanes as they move along the intake side of the abutments are forced outwardly,

' .opposite sides of and adjacent said point, a radial out when ports 4a have passed beyond passages From the foregoing description it will be readily seen that Ihave produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice suchdeviatlons from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims;

Having thus described my invention, what I claim as new and useful and desire to secure by Letters Patent is:

1. In a rotary pump which includes a casing having a chamber whose periphery includes an abutment, a rotor mounted in the casing in clearance relation to said periphery on opposite sides of the low points 01 said abutment, there being intake and outlet ports from the chamber on opposite sides of and adjacent said point, a radial vane slidably'mounted in the rotor,- and spring means urging said vane radially outward into engagement at its outer end with the periphery or said chamber, normally separating the latter into an intake side and an outlet side; passage means arranged to subject said vane at itsance relation to said periphery on opposite sides of the low point of said abutment, there being intake and outlet ports from the chamber on vane slidably mounted in the rotor, and spring means urging said vane radially outward into engagement at its outer end with the periphery of said chamber, normally separating the latter into an intake side and an outlet side; passage means arranged to subject said vane at its inner end to the suction of the intake side of said chamber during a predetermined path of travel of the vane ahead of but adjacent the zone of said low point of the abutment whereby to reduce the radially outward force exerted on the vane by said spring means while the vane traverses said path, and other passage means arranged to subject the inner end of said vane to the pressure of the outlet side of said chamber during a predetermined path of travel of the vane beyond but adjacent the zone'of said low point of the abutment whereby to supplement the radially outward force exerted on the vane by saig1 spring means while the vane traverses said pa JOHN S. AMES. 

